A standard windsock will fly perfectly horizontal in a wind of ...

A standard windsock will fly perfectly horizontal in a wind of ...

• A. 15 knots or more
• B. 6 knots
• C. 10 knots
• D. 20 knots

Answer: (A)

A windsock shows wind strength by how it sits in the air. When the wind is strong enough to fully inflate and straighten it, the sock will sit horizontally, pointing with the wind. That level of airflow happens at about 15 knots or more. Below that, the windsock tends to ride at an angle and may droop or only partially extend. Gusts can make it flutter, but a steady 15 knots or higher typically yields a perfectly horizontal orientation.

A windsock shows wind strength by how it sits in the air. When the wind is strong enough to fully inflate and straighten it, the sock will sit horizontally, pointing with the wind. That level of airflow happens at about 15 knots or more. Below that, the windsock tends to ride at an angle and may droop or only partially extend. Gusts can make it flutter, but a steady 15 knots or higher typically yields a perfectly horizontal orientation.